If you are referring to the eyebrows that are part of the Smart Hair, you do it by changing the texture colors that are part of Digital Human Shader:
I just did this to show you a 'What Not To Do Example' because I am supposed to be working.
For the other types of shaders you can use the Adjust Color option.
Creator of the free website:
PixelDatabase.Net
A Free Online Text Based Image Editor
Edited
3 Years Ago by
Data Juggler